weak loads

Hello all, I'm new to this forum and would appreciate any advice concerning my FNS9 jamming problem. I will try to give as much info as I can and hopefully someone could possibly help me resolve the intermittent failure to feed problem. When I run the gun hard(i.e. fast firing) I have no...

I read on another forum/reloading thread that burn marks on the outside of the casing is a sign of weak loads from the brass not expanding and properly sealing the gases in the chamber. When I was sorting thru the brass for my 9mm I seemed to recall seeing some blackened cases so I went looking...